docs: fix broken link to Tromer's cache.pdf paper #1726

• Updated outdated link (https://www.tau.ac.il/~tromer/papers/cache.pdf) to working link (https://cs-people.bu.edu/tromer/papers/cache.pdf).

Thanks @VolodymyrBg. Any reason to not link to eprint (https://eprint.iacr.org/2005/271.pdf)? It doesn't say "Extended Version", but it's also 25 pages and probably the most stable link.

Thanks @VolodymyrBg. Any reason to not link to eprint (https://eprint.iacr.org/2005/271.pdf)? It doesn't say "Extended Version", but it's also 25 pages and probably the most stable link.

corrected to your version

@VolodymyrBg Thanks, can you squash the two commits?

@VolodymyrBg Thanks, can you squash the two commits?

yes

@VolodymyrBg Thanks, can you squash the two commits?

Done

ACK 489a43d1bf7d886274dc24c0a544f08b7b064aec

I looked at the two versions and my conclusion is that the difference between the eprint version and the other version is just editorial. So yes, I also prefer the eprint version.